Action Taken When the DTC Sets
WARNING: This page is about a different car, the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Normal operation, the SERVICE 4WD indicator is not commanded ON. Driver is informed of fault via bulb inspection.